Patent GB-191512528-A (GB)
Title: Improvements in or relating to Adding or like Machines.
Inventor: WADE HAROLD
Filed: 1915-08-31
Abstract: 12,528. Wade, H., [Burroughs Adding Machine Co.]. Aug. 31. Adding-apparatus; repetition devices; printing totals and sub-totals.-In a Burroughs adding-machine, automatic mechanism is provided to perform repeated addition of a constant, at successive operations of the machine, and to print the progressive sub-totals obtained thereby. The machine is of the type in which amount-keys 291, Fig. 1, set stops for racks 610 and are released and restored by the cross-rod 219 of an oscillating bail ; means, however, are provided by which a key in each of certain rows may be repeatedly mechanically depressed alternately with the operation of the subtotal printing mechanism. A guide-strip 2, Figs. 1, 5, and 6, is fitted to each selected row so that the flanges 3<a> of a yoke 3 may grip underneath it opposite any key. A barrel 4 on the yoke 3 contains a spring-pressed plunger 5 adapted to depress any one of the keys 291, but fitted with a cap 6 by which it may be raised. This mechanical depression results in normal operation including the forcible restoration of the depressed keys; it is further necessary to hold these keys raised during the usual blank stroke demanded before a total printing operation and during the operation itself. For this purpose, after the bail carrying the crossrod 219 has been swung forward in known manner, a latch 8, Figs, 1 and 7, pivoted at 500 rises under the action of a spring 8<a> behind the rod 219, where it remains until removed by a stud 226<b> on a link 226 striking a branch 8<b> of the latch. The total and sub total keys 265, 265
 are mounted, as usual, on bell-crank levers 227, 227
 connected by a link 216, and the sub-total key may be mechanically depressed by a grappling rod 13 hinged to a lever 12 pivoted on a shaft 600. As a result of an adding operation, the grappling rod 13 is raised so that a hook 13<b> formed on it engages a stud 9 on the bellcrank 227
, the inclined surface 13<a> and the hook being kept in contact with the stud by a spring 13<d>. Further operation permits a spring 15 to rock the lever 12 back, thus drawing down the key 265
 to perform a sub-total printing operation ; this includes movement of the link 226, which connects the bell-crank 227 with the releasing-bail, to remove the latch 8 from behind the rod 219. The lever 12 is rocked to raise the grappling rod 13 by a pitman 16<a>, pivoted to a well-known member 813, which is periodically oscillated, and normally held by a spring 16<b> so that its laterally-turned edge 16 engages the lower of two teeth 12<b> on an extension 12<a> of the lever 12. During the first half-cycle of an operation, the pitman is lowered until a shoulder in an extension 13<c> of the grappling rod engages a fixed catch 17<a> as shown, thereby detaining the lever 12 in an intermediate position while the pitman is raised during the last half-cycle to engage the upper tooth 12<b>. The lowering of the pitman during the next half-cycle then raises the grappling rod to engage the stud 9, the pitman being then disengaged from the teeth 12b by the end of the bell-crank 227
 striking a branch 16<e> of the pitman. Finally, the grappling rod 13 is disengaged from the stud 9 by a lever 19 pivoted on the bell-crank 227
, the rear end of which is borne down by a stud on the pitman 16<a>, thus causing a stud 18 on the forward end to raise an arm 13<g> on the member 13. To mike the machine available for ordinary use, it is provided with a key 50 pivoted at 51<e> to a threearmed rocker 51, ani having a spring 52 adapted to cause a notch in its stem to engage the keyboard plate. On depression of the key, a pin 51<b> on the rocker thrusts the pitman 16<a> rearwardly, and a stud 51<d> rises to obstruct the arm 8<b> of the latch 8, so that the rod 219 is not held forward. Inopportune depression of the key 50 is prevented by contact between the stud 51<d> and the end of the arm 8<b> ; upward movement of the key 50 is limited by abutment of the stud 51<b> against the well-known elimination key 60, Fig. 1, a notch in which prevents its depression unless the key 50 is in action. Printing-mechanism; adjusting for computing or recording only; distinguishing-marks.-Disabling printing-mechanism. To prevent operation of the printing-mechanism except when progressive numbers are to be recorded, a pivoted locking-comb 20 engages behind shoulders on the printing-hammers 715, but may be lifted clear thereof by a lever 21. This is moved by an arm 22<a> of a rocker pivoted on the shaft 600 and oscillated by the contact of a stud 226<c> on the link 226 with another arm 22<b> of the rocker. This arm is also rocked by the pivot pin 51<e> when the key 50 is depressed. The wellknown action of a special type-carrier 611<a>, Fig. 14, for distinguishing totals, sub-totals, and non-added items is suspended by obstruction between an arm 72 and a pin 611<b> on the type-carrier. The arm 72 rocks about a pivot 500 and is integral with another arm 70, which is raised by the stud 51<d> on depression of the key 50, thus permitting movement of the type-carrier. Disabling line-spacing mechanism. In order that the progressive numbers may be listed in a compact column, the rocker 22<a> is provided with an arm 22<d> which operates through a series of links and levees 25, 26, 27, 29, 30, Figs. 7 and 13, on a dog 40, forming part of a line-spacing mechanism such as is described in Specification 16,800/08. The arrangement is such that line-spacing only occurs when the arm 22<d> is depressed. Operating by motors.-The machine is arranged for either hand or power operation ; in the latter case, the control devices are of the type described in Specification 18,628/06, and means are provided to obviate the necessity of continual pressure on the starting-bar 90, Fig. 2. The motor is controlled in known manner by a bar 93 which is depressed by a stud 311<a> on the full-stroke sector 311, until a catch lever 96 pivoted at 97 is caused to engage a pin 93<c> by a spring 98. The stud 311<a>, on its return movement, encounters an abutment on the lever 96, thus releasing the catch and allowing the bar 93 to be drawn upwards by a spring 92 with sufficient force to rock the starting-bar lever 90<b> and so cause a repetition of operations. The total keys and operating-mechanism are also interlocked by the means described in Specification 18,628/06. In order to prevent this repetitive action when the machine is used for ordinary addition, a key 100 is provided which, by means of a bell-crank lever 101 and link 102, is adapted to withdraw the lever 96 from the path of the pin 93<c>. Specification 16,077/11 also is referred to.